Retirement Benefit Plans (Details 5) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Amounts recognized in the consolidated balance sheets are:
Asset Amount	$ 22,110	$ 20,435	$ 18,949
Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	20,008	18,436
Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	2,102	1,999	2,093
Large value [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	629	518
Large value [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Large value [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	629	518
Large value [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Large blend [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	10,626	9,632
Large blend [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Large blend [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	10,626	9,632
Large blend [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Large growth [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	631	496
Large growth [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Large growth [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	631	496
Large growth [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Mid blend [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	64	233
Mid blend [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Mid blend [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	64	233
Mid blend [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Small blend [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	55	245
Small blend [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Small blend [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	55	245
Small blend [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Foreign large blend [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	1,679	1,617
Foreign large blend [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Foreign large blend [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	1,679	1,617
Foreign large blend [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Diversified emerging markets [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	83	31
Diversified emerging markets [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Diversified emerging markets [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	83	31
Diversified emerging markets [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Inflation protected bond [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	562	521
Inflation protected bond [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Inflation protected bond [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	562	521
Inflation protected bond [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Intermediate term bond [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	7,001	6,231
Intermediate term bond [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Intermediate term bond [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	4,899	4,232
Intermediate term bond [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	2,102	1,999
High inflation bond [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	233	310
High inflation bond [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
High inflation bond [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	233	310
High inflation bond [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Emerging markets bonds [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	226	102
Emerging markets bonds [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Emerging markets bonds [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	226	102
Emerging markets bonds [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0	0
Short-term bonds [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	321	499
Short-term bonds [Member] | Level 1 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	0
Short-term bonds [Member] | Level 2 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	321	499
Short-term bonds [Member] | Level 3 [Member]
Amounts recognized in the consolidated balance sheets are:
Asset Amount	$ 0	$ 0